[OSM-talk] Neat routing demo
Frederik Ramm
frederik at remote.org
Wed Sep 26 20:22:07 BST 2007
Hi,
> Interesting side point: the most inefficient thing about the OSM
> database for routing is, at the moment, the fact that a new way can
> start anywhere on some other way. Instead of going from the start of a
> way and springing to the end of it then looking where to go from there,
> you end up having to look at each segment and looking whether some other
> way starts there. This won't, I think, go away with 0.5?
No.
However, there is a lot to be said for ways that do not straddle
junctions, not least them making routing easier. With 0.5 there is a
*possible* development towards that; relations could then be used to
group all these "way bits" that make up a street. However this is just
a distant possibility and completely open whether things will develop
that way.
Others have put forward the case of different kinds of nodes -
"structural" nodes where ways interconnect, and "shape" nodes that
only help define the shape of a way. This would also help routing, but
hasn't even received a broad discussion.
So we're quite far away from anything that would make your life easier
in that department. But it's not impossible either.
Bye
Frederik
--
Frederik Ramm ## eMail frederik at remote.org ## N49°00.09' E008°23.33'
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